Long-term trends and response of wet ammonia deposition to changes in anthropogenic emissions in the Pearl River delta of China  

作　　者：Mingyue Li Lyumeng Ye Ming Chang Weihua Chen Shuidi He Buqing Zhong Xuemei Wang 

机构地区：[1]Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality,Institute for Environmental and Climate Research,Jinan University,Guangzhou 511443,China [2]South China Institute of Environmental Sciences,The Ministry of Ecology and Environment of PRC,Guangzhou 510530,China [3]Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems,South China Botanical Garden,Chinese Academy of Sciences,Guangzhou 510650,China

出　　处：《Journal of Environmental Sciences》2025年第5期373-386,共14页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation(Nos.42275107,42121004,and 42375109);the National Key Research and Development Plan(No.2023YFC3706202);the Foundational and Applied Basic Research in Guangzhou in 2023(No.2023A04J0251);the Special Fund Project for Science and Technology Innovation Strategy of Guangdong Province(No.2019B121205004).

摘　　要：The Pearl River Delta(PRD)region has been identified as a significant hotspot of wet ammonium deposition.However,the absence of long-term monitoring data in the area hinders the comprehension of the historical trends and changes in wet NH_(4)^(+)-N deposition in response to emissions,which interferes with the ability to make effective decisions.This study has analyzed the long-term trends of wet NH_(4)^(+)-N deposition flux and has quantified the effect of anthropogenic emissions and meteorological factors at a typical urban site and a typical forest site in the PRD region from 2009 to 2020.It revealed a significant decreasing trend in wet NH_(4)^(+)-N flux in both the typical urban and forest areas of the PRD region,at-6.2%/year(p<0.001)and-3.3%/year(p<0.001),respectively.Anthropogenic emissions are thought to have contributed 47%–57%of the wet NH_(4)^(+)-N deposition trend over the past 12 years compared to meteorological factors.Meteorological conditions dominated the interannual fluctuations in wet NH_(4)^(+)-N deposition with an absolute contribution of 46%–52%,while anthropogenic emissions change alone explained 10%–31%.NH_(3)emissions have the greatest impact on the urban area among anthropogenic emission factors,while SO_(2)emissions have the greatest impact on the forest area.Additionally,precipitation was identified as the primary meteorological driver for both sites.Our findings also imply that the benefits of NH_(3)emissions reductions might not immediately emerge due to interference from weather-related factors.

关 键 词：Long-term trends Inter-annual variation Wet ammonium deposition Anthropogenic emission change Meteorological condition The Pearl River Delta region 

分 类 号：X172[环境科学与工程—环境科学] X53